IBM DJSA-210 Hard Drive Specifications - Page 103

Set Max security extension commands, Set Max SET PASSWORD data content

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Test the sectors for protected area (LBA > = 0FC000h) if required. Write information data such as BIOS code within the protected area. Change maximum LBA using Set Max ADDRESS command to 0FBFFFh with nonvolatile option. From this point, the protected area cannot be accessed until next Set Max ADDRESS command is issued. Any BIOS, device driver, or application software accesses the HDD as if it is a 528 MB device because the device behaves like a 528 MB device. 3. Conventional usage without system software support: Since the HDD works as a 528 MB device, there is no special care required for normal use of this device. 4. Advanced usage using protected area: The data in the protected area is accessed by the following steps. Issue Read Native Max ADDRESS command to get the real device max. LBA/CYL. Returned value shows that native device Max LBA is 0FFFFFh regardless of the current setting. Make entire device accessible, including the protected area, by setting device Max LBA as 0FFFFFh via Set Max ADDRESS command with the volatile option. By using this option, unexpected power removal or reset will prevent the protected area from remaining accessible. Read information data from protected area. Issue hard reset or POR to inhibit any access to the protected area. 11.9.2 Set Max security extension commands The Set Max SET PASSWORD command allows the host to define the password to be used during the current power on cycle. This password is not related to the password used for the Security Mode Feature set. When the password is set the device is in the Set Max Unlocked mode. This command requests a transfer of a single sector of data from the host. The following figure defines the content of this sector of information. The password is retained by the device until the next power cycle. When the device accepts this command the device is in Set Max Unlocked mode. Word 0 1-16 17-255 Content Reserved Password (32 bytes) Reserved Figure 65. Set Max SET PASSWORD data content The Set Max LOCK command allows the host to disable the Set Max commands (except Set Max UNLOCK and Set Max FREEZE LOCK) until the next power cycle or the issuance and acceptance of the Set Max UNLOCK command. When this command is accepted the device is in the Set Max Locked mode. The Set Max UNLOCK command changes the device from the Set Max Locked mode to the Set Max Unlocked mode. Travelstar 32GH/30GT/20GN hard disk drive specifications 89

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Test the sectors for protected area (LBA > = 0FC000h) if required.
Write information data such as BIOS code within the protected area.
Change maximum LBA using Set Max ADDRESS command to 0FBFFFh with nonvolatile option.
From this point, the protected area cannot be accessed until next Set Max ADDRESS command is
issued. Any BIOS, device driver, or application software accesses the HDD as if it is a 528 MB
device because the device behaves like a 528 MB device.
3. Conventional usage without system software support:
Since the HDD works as a 528 MB device, there is no special care required for normal use of this
device.
4. Advanced usage using protected area:
The data in the protected area is accessed by the following steps.
Issue Read Native Max ADDRESS command to get the real device max.
LBA/CYL. Returned value shows that native device Max LBA is 0FFFFFh regardless of the
current setting.
Make entire device accessible, including the protected area, by setting device Max LBA as
0FFFFFh via Set Max ADDRESS command with the volatile option. By using this option, unexpected
power removal or reset will prevent the protected area from remaining accessible.
Read information data from protected area.
Issue hard reset or POR to inhibit any access to the protected area.
11.9.2 Set Max security extension commands
The Set Max SET PASSWORD command allows the host to define the password to be used during the
current power on cycle. This password is not related to the password used for the Security Mode Feature
set. When the password is set the device is in the Set Max Unlocked mode.
This command requests a transfer of a single sector of data from the host. The following figure defines the
content of this sector of information. The password is retained by the device until the next power cycle.
When the device accepts this command the device is in Set Max Unlocked mode.
Reserved
17-255
Password (32 bytes)
1-16
Reserved
0
Content
Word
Figure 65.
Set Max SET PASSWORD data content
The Set Max LOCK command allows the host to disable the Set Max commands (except Set Max
UNLOCK and Set Max FREEZE LOCK) until the next power cycle or the issuance and acceptance of the
Set Max UNLOCK command. When this command is accepted the device is in the Set Max Locked mode.
The Set Max UNLOCK command changes the device from the Set Max Locked mode to the Set Max
Unlocked mode.
Travelstar 32GH/30GT/20GN hard disk drive specifications
89